Quarterly Results of Operations (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 36	$ 36	$ 36	$ 42	$ 53	$ 39	$ 49	$ 72	$ 150	$ 213	$ 161
Costs and expenses	(3,448)	(4,495)	(4,770)	(4,604)	(8,048)	(5,004)	(3,682)	(3,819)	(17,317)	(20,553)	(14,456)
Income (expense)	165	85	349	176	719	346	246	262	775	1,573
Other than temporary impairment loss on marketable securities	0	(800)	0	0					(800)	(9)	0
Sales of tax NOL	0	0	0	686	0	0	0	1,328	686	1,328	2,272
valuation adjustment	52	38	102	89	1,817	(1,968)	387	(151)	281	85	2,425
Net loss	(3,195)	(5,136)	(4,283)	(3,611)	(5,459)	(6,587)	(3,000)	(2,308)	(16,225)	(17,354)	(9,015)
Basic and diluted loss per share (in usd per share)	$ (0.02)	$ (0.03)	$ (0.03)	$ (0.02)	$ (0.03)	$ (0.05)	$ (0.02)	$ (0.02)	$ (0.10)	$ (0.12)	$ (0.07)
Inventory Valuation Reserves, Beginning Balance				1,215				192	1,215	192	249
Inventory Valuation Reserves, Charged to Expense	458				1,023				458	1,023	192
Inventory Valuation Reserves, Write-Offs	(1,673)				0				(1,673)	0	(249)
Inventory Valuation Reserves, Ending Balance	$ 0				$ 1,215				$ 0	$ 1,215	$ 192